Party members will support emergency motion opposing secret courts at this weekend's conference after just seven Lib Dem MPs voted against the bill.

There's disappointment and some anger among Lib Dem members this morning after just seven of the party's 57 MPs voted against the government's plans for secret courts last night. The party's new boy, Eastleigh MP Mike Thornton, had a legitimate excuse (he hasn't been sworn in yet) but the rest stand accused of ignoring the wishes of party members, who voted overwhelmingly to oppose the policy at last year's autumn conference. As Richard Morris wrote on The Staggers yesterday, after winning the ground war in Eastleigh, Lib Dem activists wanted "payback".

Last night's rebellion may have been small but it was significant. Party president Tim Farron and deputy leader Simon Hughes were among those who voted in favour of Labour's amendments, including the introduction of a public interest test for secret courts, with Sarah Teather, Julian Huppert, Greg Mullholland, Mike Crockart and John Hemming joining them in the no lobby. As Stephen Tall notes at Lib Dem Voice, Teather, not the flavour of the month among progressives after her vote against equal marriage, posted this statement on her Facebook page:

I rebelled on a series of votes this evening on the Justice and Security Bill. Having spent most of my time in Parliament campaigning against rendition, guantanamo bay and torture I take a close interest in matters like this. My Libdem colleagues Julian Huppert and Mike Crockart have done a great job getting changes to the bill during the committee stage and there is no doubt it is a better bill, but I still didn’t feel the safeguards the Government has given on the use of secret courts were convincing enough.

The battle will now move to the party's spring conference in Brighton this weekend, where Lib Dem members will vote on an emergency motion tabled by activists calling for the party to reaffirm its opposition to secret courts.

After the party's by-election success, most have assumed that Nick Clegg will face an easier ride than in previous years. But the opposite is likely to be true. Had the party lost the seat, members may have closed ranks for fear of provoking an ever greater crisis. But victory in Eastleigh has encouraged a new mood of assertiveness among the grass roots. With activists also angered by the government's new backdoor NHS privatisation, expect fireworks this weekend.